获取函数名

如果当前函数是有名函数，则返回其名字，如果是匿名函数则返回被赋值的函数变量名，如果是闭包中匿名函数则返回“anonymous”。

     var getFnName = function(callee){
      var _callee = callee.toString().replace(/[\s\?]*/g,""),
      comb = _callee.length >= 50 ? 50 :_callee.length;
      _callee = _callee.substring(0,comb);
      var name = _callee.match(/^function([^\(]+?)\(/);
      if(name && name[1]){
        return name[1];
      }
      var caller = callee.caller,
      _caller = caller.toString().replace(/[\s\?]*/g,"");
      var last = _caller.indexOf(_callee),
      str = _caller.substring(last-30,last);
      name = str.match(/var([^\=]+?)\=/);
      if(name && name[1]){
        return name[1];
      }
      return "anonymous"
    };

使用：在要调查的函数内部执行此函数，传入一个参数，为arguments.callee。

    function  ee(){
      //+++++++++++++++++++++++++++++++++
      var fnname =getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(fnname)
    };
    ee();

<!doctype html>
<html dir="ltr" lang="zh-CN">
  <head>
    <meta charset="utf-8"/>
    <title>getFnName by 司徒正美</title>

hasname();
    //匿名函数（函数表达式）
    var noname = function(){
      //+++++++++++++++++++++++++++++++++
      var bb = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(bb)
    };
    noname();
   //闭包
    (function(){
      //+++++++++++++++++++++++++++++++++
      var cc = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(cc)
    })();
  }
    </script>
  </head>
  <body>
    <pre>
    //有名函数（函数定义）
    function hasname (){
      var aa = getFnName(arguments.callee)
      //+++++++++++++++++++++++++++++++++
      alert(aa)
    }

</body>
</html>

posted on 2009-11-06 17:24 司徒正美阅读(5576) 评论(11) 收藏举报

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获取函数名